<!doctype html>
<html lang="zh-CN">
	<head>
		<meta charset="utf-8">
		<meta http-equiv="X-UA-Compatible" content="IE=edge">
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
		<title>Bootstrap 101 Template</title>

		<!-- Bootstrap -->
		<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"
			integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">

		<!-- HTML5 shim 和 Respond.js 是为了让 IE8 支持 HTML5 元素和媒体查询（media queries）功能 -->
		<!-- 警告：通过 file:// 协议（就是直接将 html 页面拖拽到浏览器中）访问页面时 Respond.js 不起作用 -->
		<!--[if lt IE 9]>
      <script src="https://cdn.jsdelivr.cn/npm/html5shiv@3.7.3/dist/html5shiv.min.js"></script>
      <script src="https://cdn.jsdelivr.cn/npm/respond.js@1.4.2/dest/respond.min.js"></script>
    <![endif]-->
	</head>
	<body>
		<h1>你好，世界！</h1>
		<!-- Standard button -->
		<button type="button" class="btn btn-default">（默认样式）Default</button>
		
		<!-- Provides extra visual weight and identifies the primary action in a set of buttons -->
		<button type="button" class="btn btn-primary">（首选项）Primary</button>
		
		<!-- Indicates a successful or positive action -->
		<button type="button" class="btn btn-success">（成功）Success</button>
		
		<!-- Contextual button for informational alert messages -->
		<button type="button" class="btn btn-info">（一般信息）Info</button>
		
		<!-- Indicates caution should be taken with this action -->
		<button type="button" class="btn btn-warning">（警告）Warning</button>
		
		<!-- Indicates a dangerous or potentially negative action -->
		<button type="button" class="btn btn-danger">（危险）Danger</button>
		
		<!-- Deemphasize a button by making it look like a link while maintaining button behavior -->
		<button type="button" class="btn btn-link">（链接）Link</button>

		<!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery，所以必须放在前边) -->
		<script src="https://cdn.jsdelivr.cn/npm/jquery@1.12.4/dist/jquery.min.js"
			integrity="sha384-nvAa0+6Qg9clwYCGGPpDQLVpLNn0fRaROjHqs13t4Ggj3Ez50XnGQqc/r8MhnRDZ" crossorigin="anonymous">
		</script>
		<!-- 加载 Bootstrap 的所有 JavaScript 插件。你也可以根据需要只加载单个插件。 -->
		<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"
			integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous">
		</script>
	</body>
</html>
